北京航空航天大学学报 ›› 2010, Vol. 36 ›› Issue (3): 315-318.

• 论文 • 上一篇    下一篇

考虑土渐近状态特性的应力应变关系

罗 汀, 田新国   

  1. 北京航空航天大学 交通科学与工程学院, 北京 100191
  • 收稿日期:2009-01-01 出版日期:2010-03-31 发布日期:2010-09-13
  • 作者简介:罗 汀(1957-),福建长汀人,女,副教授,tluo@buaa.edu.cn.
  • 基金资助:

    国家自然科学基金资助项目(50879001,10872016,90815024)

Stress-strain incremental law in asymptotic state for soils

Luo Ting, Tian Xinguo   

  1. School of Transportation Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
  • Received:2009-01-01 Online:2010-03-31 Published:2010-09-13

摘要: 在经典弹塑性理论框架下,根据SMP(Spatially Mobilized Plane)破坏准则并结合变换应力方法,通过引入准弹性体积模量的概念,建立了用增量法表示的考虑土渐近状态特性的三维应力应变关系式.针对三轴压缩应力条件,给出了相应的简化应力应变增量矩阵,以三轴压缩试验中的常规三轴压缩、不排水剪切和控制应变增量比的3种应力路径为例,推导出了便于应用的应力应变增量关系式.最后,利用文中的公式进行了预测分析和试验对比,结果表明:新推导的公式能方便地预测考虑渐近状态特性下土的应力应变关系,并能合理描述试验结果.

Abstract: Based on the classical elasto-plastic theory, the transformed stress space deduced from the spatially mobilized plane(SMP) criterion and a new concept of similar elastic volume modulus, the stress-strain incremental equations of soils for the asymptotic state constitutive model were established. A simple stress-strain incremental matrix under triaxial compression condition was formulated, in which the modified Cam-clay model was a special case. The stress-strain incremental equations were then proposed to simulate the stress-strain relationships in some triaxial stress path tests as the triaxial compression, the consolidated undrained and the strain incremental ratio controlled. The proposed equations were used to simulate and compare the triaxial test results. They show that the equations proposed can be used easily and the asymptote state model can describe the stress-strain and strength behaviors of soils reasonably.

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